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Electric utility segment - Condensed Consolidating Balance Sheet (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Nov. 01, 2024	Mar. 31, 2024	Dec. 31, 2023
Utility property, plant and equipment
Total property, plant and equipment, net	$ 6,138,288	$ 6,134,318
Current assets
Cash and cash equivalents	629,338	750,535		$ 258,252
Regulatory assets	42,751	53,895
Total current assets	1,946,374	2,134,326
Other long-term assets
Operating lease right-of-use assets	65,657	66,553
Total assets	8,766,181	8,931,416
Capitalization
Common stock equity	1,505,876	1,479,089		2,377,380	$ 2,344,841
Preferred stock of subsidiaries - not subject to mandatory redemption	34,293	34,293
Current liabilities
Current portion of long-term debt	414,897	109,171
Accounts payable	207,115	203,452
Interest and dividends payable	39,317	27,203
Regulatory liabilities	28,071	26,568
Wildfire tort-related claims (Note 2)	478,750	478,750
Other	342,131	430,824
Total current liabilities	1,559,019	1,324,591
Deferred credits and other liabilities
Operating lease liabilities	54,469	56,523
Finance lease liabilities	465,881	426,598
Regulatory liabilities	1,246,301	1,217,515
Defined benefit pension and other postretirement benefit plans liability	23,095	23,213
Wildfire tort-related claims	1,436,250	1,436,250
Other	237,931	242,957
Total liabilities and shareholders’ equity	8,766,181	8,931,416
Hawaiian Electric Consolidated
Utility property, plant and equipment
Land	52,019	52,019
Plant and equipment	8,487,909	8,421,501
Right-of-use assets - finance lease	489,404	447,101
Less accumulated depreciation	(3,381,214)	(3,326,624)
Construction in progress	376,205	365,709
Utility property, plant and equipment, net	6,024,323	5,959,706
Nonutility property, plant and equipment, less accumulated depreciation	2,793	2,792
Total property, plant and equipment, net	6,027,116	5,962,498
Investment in wholly owned subsidiaries, at equity	0	0
Current assets
Cash and cash equivalents	130,426	184,148		129,754
Advances to affiliates	0	0
Customer accounts receivable, net	191,654	199,898
Accrued unbilled revenues, net	164,206	178,721
Other accounts receivable, net	78,287	69,637
Fuel oil stock, at average cost	113,355	98,903
Materials and supplies, at average cost	127,305	118,466
Prepayments and other	98,297	151,220
Regulatory assets	42,751	53,895
Total current assets	946,281	1,054,888
Other long-term assets
Operating lease right-of-use assets	58,543	59,281
Regulatory assets	233,050	227,424
Investment in unconsolidated affiliate	287,250	0
Defined benefit pension and other postretirement benefit plans asset	110,597	108,819
Other	201,307	200,694
Total other long-term assets	890,747	596,218
Total assets	7,864,144	7,613,604
Capitalization
Common stock equity	1,492,244	1,156,955		2,435,282	2,409,110
Preferred stock of subsidiaries - not subject to mandatory redemption	34,293	34,293
Long-term debt, net	1,809,424	1,854,214
Total capitalization	3,335,961	3,045,462
Current liabilities
Current portion of operating lease liabilities	16,124	15,202
Current portion of long-term debt	0	47,000
Accounts payable	197,841	196,980
Interest and dividends payable	28,160	21,536
Taxes accrued, including revenue taxes	218,254	272,001
Regulatory liabilities	28,071	26,568
Wildfire tort-related claims (Note 2)	478,750	478,750	$ 479,000
Other	111,187	121,011
Total current liabilities	1,127,125	1,227,671
Deferred credits and other liabilities
Operating lease liabilities	47,313	49,135
Finance lease liabilities	465,068	425,625
Regulatory liabilities	1,246,301	1,217,515
Deferred income taxes	0	0
Unamortized tax credits	74,508	76,676
Defined benefit pension and other postretirement benefit plans liability	6,423	6,428
Wildfire tort-related claims	1,436,250	1,436,250
Other	125,195	128,842
Total deferred credits and other liabilities	3,401,058	3,340,471
Total liabilities and shareholders’ equity	7,864,144	7,613,604
Hawaiian Electric Consolidated | Nonrelated Party
Current liabilities
Short-term borrowings from non-affiliates, net	48,738	48,623
Hawaiian Electric Consolidated | Affiliated Entity
Current liabilities
Short-term borrowings from non-affiliates, net	0	0
Consolidating adjustments | Hawaiian Electric Consolidated
Utility property, plant and equipment
Land	0	0
Plant and equipment	0	0
Right-of-use assets - finance lease	0	0
Less accumulated depreciation	0	0
Construction in progress	0	0
Utility property, plant and equipment, net	0	0
Nonutility property, plant and equipment, less accumulated depreciation	0	0
Total property, plant and equipment, net	0	0
Investment in wholly owned subsidiaries, at equity	(690,349)	(680,414)
Current assets
Cash and cash equivalents	0	0		0
Advances to affiliates	(76,200)	(62,200)
Customer accounts receivable, net	0	0
Accrued unbilled revenues, net	0	0
Other accounts receivable, net	(217,285)	(249,946)
Fuel oil stock, at average cost	0	0
Materials and supplies, at average cost	0	0
Prepayments and other	(9,701)	(6,705)
Regulatory assets	0	0
Total current assets	(303,186)	(318,851)
Other long-term assets
Operating lease right-of-use assets	0	0
Regulatory assets	0	0
Investment in unconsolidated affiliate	0
Defined benefit pension and other postretirement benefit plans asset	(12,711)	(11,998)
Other	(35,003)	(33,626)
Total other long-term assets	(47,714)	(45,624)
Total assets	(1,041,249)	(1,044,889)
Capitalization
Common stock equity	(690,349)	(680,414)		(728,222)	(722,211)
Preferred stock of subsidiaries - not subject to mandatory redemption	0	0
Long-term debt, net	0	0
Total capitalization	(690,349)	(680,414)
Current liabilities
Current portion of operating lease liabilities	0	0
Current portion of long-term debt		0
Accounts payable	0	0
Interest and dividends payable	(417)	(350)
Taxes accrued, including revenue taxes	(9,701)	(6,705)
Regulatory liabilities	0	0
Wildfire tort-related claims (Note 2)	0	0
Other	(216,868)	(249,597)
Total current liabilities	(303,186)	(318,852)
Deferred credits and other liabilities
Operating lease liabilities	0	0
Finance lease liabilities	0	0
Regulatory liabilities	0	0
Deferred income taxes	(35,003)	(33,625)
Unamortized tax credits	0	0
Defined benefit pension and other postretirement benefit plans liability	(12,711)	(11,998)
Wildfire tort-related claims	0	0
Other	0	0
Total deferred credits and other liabilities	(47,714)	(45,623)
Total liabilities and shareholders’ equity	(1,041,249)	(1,044,889)
Consolidating adjustments | Hawaiian Electric Consolidated | Nonrelated Party
Current liabilities
Short-term borrowings from non-affiliates, net	0	0
Consolidating adjustments | Hawaiian Electric Consolidated | Affiliated Entity
Current liabilities
Short-term borrowings from non-affiliates, net	(76,200)	(62,200)
Hawaiian Electric | Reportable Legal Entities | Hawaiian Electric Consolidated
Utility property, plant and equipment
Land	42,860	42,860
Plant and equipment	5,537,541	5,502,198
Right-of-use assets - finance lease	360,270	360,270
Less accumulated depreciation	(2,068,882)	(2,029,719)
Construction in progress	290,765	282,150
Utility property, plant and equipment, net	4,162,554	4,157,759
Nonutility property, plant and equipment, less accumulated depreciation	1,146	1,145
Total property, plant and equipment, net	4,163,700	4,158,904
Investment in wholly owned subsidiaries, at equity	690,349	680,414
Current assets
Cash and cash equivalents	75,491	118,367		111,200
Advances to affiliates	76,200	62,200
Customer accounts receivable, net	12,885	19,050
Accrued unbilled revenues, net	2,926	12,738
Other accounts receivable, net	180,532	209,752
Fuel oil stock, at average cost	80,499	70,800
Materials and supplies, at average cost	74,662	69,602
Prepayments and other	73,005	110,516
Regulatory assets	30,929	36,520
Total current assets	607,129	709,545
Other long-term assets
Operating lease right-of-use assets	31,733	29,868
Regulatory assets	174,833	172,257
Investment in unconsolidated affiliate	287,250
Defined benefit pension and other postretirement benefit plans asset	68,045	66,292
Other	196,025	194,006
Total other long-term assets	757,886	462,423
Total assets	6,219,064	6,011,286
Capitalization
Common stock equity	1,492,244	1,156,955		2,435,282	2,409,110
Preferred stock of subsidiaries - not subject to mandatory redemption	22,293	22,293
Long-term debt, net	1,308,318	1,353,173
Total capitalization	2,822,855	2,532,421
Current liabilities
Current portion of operating lease liabilities	5,158	4,430
Current portion of long-term debt		40,000
Accounts payable	135,526	137,837
Interest and dividends payable	20,728	15,994
Taxes accrued, including revenue taxes	164,116	197,768
Regulatory liabilities	9,162	11,701
Wildfire tort-related claims (Note 2)	383,000	383,000
Other	84,193	103,415
Total current liabilities	850,621	942,768
Deferred credits and other liabilities
Operating lease liabilities	30,820	29,830
Finance lease liabilities	339,208	341,364
Regulatory liabilities	878,701	864,259
Deferred income taxes	0	0
Unamortized tax credits	53,241	54,950
Defined benefit pension and other postretirement benefit plans liability	19,009	18,301
Wildfire tort-related claims	1,149,000	1,149,000
Other	75,609	78,393
Total deferred credits and other liabilities	2,545,588	2,536,097
Total liabilities and shareholders’ equity	6,219,064	6,011,286
Hawaiian Electric | Reportable Legal Entities | Hawaiian Electric Consolidated | Nonrelated Party
Current liabilities
Short-term borrowings from non-affiliates, net	48,738	48,623
Hawaiian Electric | Reportable Legal Entities | Hawaiian Electric Consolidated | Affiliated Entity
Current liabilities
Short-term borrowings from non-affiliates, net	0	0
Hawaii Electric Light | Reportable Legal Entities | Hawaiian Electric Consolidated
Utility property, plant and equipment
Land	5,645	5,645
Plant and equipment	1,512,057	1,501,947
Right-of-use assets - finance lease	78,377	36,074
Less accumulated depreciation	(699,329)	(691,161)
Construction in progress	32,792	31,341
Utility property, plant and equipment, net	929,542	883,846
Nonutility property, plant and equipment, less accumulated depreciation	115	115
Total property, plant and equipment, net	929,657	883,961
Investment in wholly owned subsidiaries, at equity	0	0
Current assets
Cash and cash equivalents	28,523	31,534		11,146
Advances to affiliates	0	0
Customer accounts receivable, net	5,181	7,245
Accrued unbilled revenues, net	2,326	4,046
Other accounts receivable, net	57,190	58,366
Fuel oil stock, at average cost	13,133	13,764
Materials and supplies, at average cost	17,211	15,506
Prepayments and other	10,034	16,662
Regulatory assets	5,907	8,211
Total current assets	139,505	155,334
Other long-term assets
Operating lease right-of-use assets	20,784	22,672
Regulatory assets	19,349	18,875
Investment in unconsolidated affiliate	0
Defined benefit pension and other postretirement benefit plans asset	30,841	30,397
Other	18,454	18,612
Total other long-term assets	89,428	90,556
Total assets	1,158,590	1,129,851
Capitalization
Common stock equity	247,686	243,964		364,177	359,790
Preferred stock of subsidiaries - not subject to mandatory redemption	7,000	7,000
Long-term debt, net	244,494	244,466
Total capitalization	499,180	495,430
Current liabilities
Current portion of operating lease liabilities	7,952	7,802
Current portion of long-term debt		5,000
Accounts payable	26,053	27,077
Interest and dividends payable	3,598	3,191
Taxes accrued, including revenue taxes	32,964	42,692
Regulatory liabilities	14,649	10,039
Wildfire tort-related claims (Note 2)	47,875	47,875
Other	27,959	35,492
Total current liabilities	161,050	179,168
Deferred credits and other liabilities
Operating lease liabilities	13,187	15,230
Finance lease liabilities	76,117	34,370
Regulatory liabilities	225,925	222,834
Deferred income taxes	6,640	5,368
Unamortized tax credits	10,533	10,757
Defined benefit pension and other postretirement benefit plans liability	125	125
Wildfire tort-related claims	143,625	143,625
Other	22,208	22,944
Total deferred credits and other liabilities	498,360	455,253
Total liabilities and shareholders’ equity	1,158,590	1,129,851
Hawaii Electric Light | Reportable Legal Entities | Hawaiian Electric Consolidated | Nonrelated Party
Current liabilities
Short-term borrowings from non-affiliates, net	0	0
Hawaii Electric Light | Reportable Legal Entities | Hawaiian Electric Consolidated | Affiliated Entity
Current liabilities
Short-term borrowings from non-affiliates, net	0	0
Maui Electric | Reportable Legal Entities | Hawaiian Electric Consolidated
Utility property, plant and equipment
Land	3,514	3,514
Plant and equipment	1,438,311	1,417,356
Right-of-use assets - finance lease	50,757	50,757
Less accumulated depreciation	(613,003)	(605,744)
Construction in progress	52,648	52,218
Utility property, plant and equipment, net	932,227	918,101
Nonutility property, plant and equipment, less accumulated depreciation	1,532	1,532
Total property, plant and equipment, net	933,759	919,633
Investment in wholly owned subsidiaries, at equity	0	0
Current assets
Cash and cash equivalents	6,010	16,456		7,331
Advances to affiliates	0	0
Customer accounts receivable, net	7,660	8,941
Accrued unbilled revenues, net	253	1,890
Other accounts receivable, net	57,850	51,465
Fuel oil stock, at average cost	19,723	14,339
Materials and supplies, at average cost	35,432	33,358
Prepayments and other	24,959	30,747
Regulatory assets	5,915	9,164
Total current assets	157,802	166,360
Other long-term assets
Operating lease right-of-use assets	6,026	6,741
Regulatory assets	38,868	36,292
Investment in unconsolidated affiliate	0
Defined benefit pension and other postretirement benefit plans asset	24,422	24,128
Other	21,831	21,702
Total other long-term assets	91,147	88,863
Total assets	1,182,708	1,174,856
Capitalization
Common stock equity	287,396	282,876		363,968	362,344
Preferred stock of subsidiaries - not subject to mandatory redemption	5,000	5,000
Long-term debt, net	256,612	256,575
Total capitalization	549,008	544,451
Current liabilities
Current portion of operating lease liabilities	3,014	2,970
Current portion of long-term debt		2,000
Accounts payable	36,262	32,066
Interest and dividends payable	4,251	2,701
Taxes accrued, including revenue taxes	29,149	37,108
Regulatory liabilities	4,260	4,828
Wildfire tort-related claims (Note 2)	47,875	47,875
Other	27,865	43,913
Total current liabilities	228,876	235,661
Deferred credits and other liabilities
Operating lease liabilities	3,306	4,075
Finance lease liabilities	49,743	49,891
Regulatory liabilities	141,675	130,422
Deferred income taxes	28,363	28,257
Unamortized tax credits	10,734	10,969
Defined benefit pension and other postretirement benefit plans liability	0	0
Wildfire tort-related claims	143,625	143,625
Other	27,378	27,505
Total deferred credits and other liabilities	404,824	394,744
Total liabilities and shareholders’ equity	1,182,708	1,174,856
Maui Electric | Reportable Legal Entities | Hawaiian Electric Consolidated | Nonrelated Party
Current liabilities
Short-term borrowings from non-affiliates, net	0	0
Maui Electric | Reportable Legal Entities | Hawaiian Electric Consolidated | Affiliated Entity
Current liabilities
Short-term borrowings from non-affiliates, net	76,200	62,200
Other subsidiaries | Reportable Legal Entities | Hawaiian Electric Consolidated
Utility property, plant and equipment
Land	0	0
Plant and equipment	0	0
Right-of-use assets - finance lease	0	0
Less accumulated depreciation	0	0
Construction in progress	0	0
Utility property, plant and equipment, net	0	0
Nonutility property, plant and equipment, less accumulated depreciation	0	0
Total property, plant and equipment, net	0	0
Investment in wholly owned subsidiaries, at equity	0	0
Current assets
Cash and cash equivalents	20,402	17,791		77
Advances to affiliates	0	0
Customer accounts receivable, net	165,928	164,662
Accrued unbilled revenues, net	158,701	160,047
Other accounts receivable, net	0	0
Fuel oil stock, at average cost	0	0
Materials and supplies, at average cost	0	0
Prepayments and other	0	0
Regulatory assets	0	0
Total current assets	345,031	342,500
Other long-term assets
Operating lease right-of-use assets	0	0
Regulatory assets	0	0
Investment in unconsolidated affiliate	0
Defined benefit pension and other postretirement benefit plans asset	0	0
Other	0	0
Total other long-term assets	0	0
Total assets	345,031	342,500
Capitalization
Common stock equity	155,267	153,574		$ 77	$ 77
Preferred stock of subsidiaries - not subject to mandatory redemption	0	0
Long-term debt, net	0	0
Total capitalization	155,267	153,574
Current liabilities
Current portion of operating lease liabilities	0	0
Current portion of long-term debt		0
Accounts payable	0	0
Interest and dividends payable	0	0
Taxes accrued, including revenue taxes	1,726	1,138
Regulatory liabilities	0	0
Wildfire tort-related claims (Note 2)	0	0
Other	188,038	187,788
Total current liabilities	189,764	188,926
Deferred credits and other liabilities
Operating lease liabilities	0	0
Finance lease liabilities	0	0
Regulatory liabilities	0	0
Deferred income taxes	0	0
Unamortized tax credits	0	0
Defined benefit pension and other postretirement benefit plans liability	0	0
Wildfire tort-related claims	0	0
Other	0	0
Total deferred credits and other liabilities	0	0
Total liabilities and shareholders’ equity	345,031	342,500
Other subsidiaries | Reportable Legal Entities | Hawaiian Electric Consolidated | Nonrelated Party
Current liabilities
Short-term borrowings from non-affiliates, net	0	0
Other subsidiaries | Reportable Legal Entities | Hawaiian Electric Consolidated | Affiliated Entity
Current liabilities
Short-term borrowings from non-affiliates, net	$ 0	$ 0

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Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer.

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Amount of equity (deficit) attributable to parent. Excludes temporary equity and equity attributable to noncontrolling interest.

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